back o' Bourke vs north forty

back o' Bourke

name

  • An extremely remote place. 

adv

  • At or to an extremely remote place. 

north forty

noun

  • A 40-acre section of land, located in the northernmost part of a farm or ranch. 

  • Any remote place. 

  • Farms, ranches, or agricultural land collectively. 

How often have the words back o' Bourke and north forty occurred in a corpus of books? (source: Google Ngram Viewer )